What Causes Air Bubbles on the Surface of UHPC Components? Qinglong UHPC Bubble Control Technology

Surface bubbles in UHPC components are mainly caused by entrained air in raw materials, air trapped during mixing, and insufficient air release during pouring. By optimizing the mix ratio and process, the bubble rate can be controlled within 3%. Through vacuum mixing, mould vibration technology, and compound defoamer technology, Qinglong UHPC achieves surface bubbles with a diameter ≤0.2mm and spacing ≥3mm, reaching a decorative fair-faced finish.

For bubble control, four key technologies are adopted: first, defoamers are used (dosage 0.1%-0.3%) to reduce the surface tension of the slurry; second, vacuum mixing (vacuum degree -0.08MPa) is applied to remove entrained air; third, the vibration process is optimized (frequency 50Hz, amplitude 0.5mm) to promote bubble release; finally, demolding time is controlled (16-24h) to avoid surface bubbles caused by premature demolding. These measures give UHPC components a mirror-like surface quality.

Analysis of Bubble Formation Causes

Entrained air in raw materials: high powder fineness traps air; air trapped in mixing: excessive mixing speed draws in air; these causes lead to bubbles.

Technical Control Measures

Use defoamers to reduce surface tension; vacuum mixing to remove entrained air; optimized vibration to promote bubble release; these measures eliminate bubbles.

Process Parameter Optimization

Mixing speed is controlled at 60-80rpm; vibration frequency 50Hz, amplitude 0.5mm; these parameters deliver optimized results.

Quality Acceptance Criteria

Bubble diameter ≤0.2mm; spacing ≥3mm; these criteria ensure quality.

Bubble control requires systematic measures. With Qinglong UHPC's advanced technology, products feature an attractive surface finish.